Here's four tips for burning out a drum.
1. Use hardwood only- it burns hot, doesn't leave a sappy film and smells good.
2. The barrel doesn't have to be upright- it can be on its side and roll it
3. My favorite is to throw the barrels in a big ass brush fire- if you can get near it then its not big enough.
4. If burning near a shop with a compressor, then use a long nozzle air gun and help the fire where you need to- like a black smith. You can cherry any spot!